If you have installed Ambari then you might want to create HDP cluster.
You can refer to the following Step By Step tutorial, Videos from Hortonworks Youtube Channel:
1). Hadoop Series- Part1 Multinode Hadoop Cluster Installation using Ambari : https://www.youtube.com/watch?v=wHaVBoLwzwU
2). Hadoop Series- Part2 How to Add Node To Existing Hadoop Cluster : https://www.youtube.com/watch?v=jiCI4yIkUlc
If you want to run some realtime examples and go through Hortonworks tutorials then please refer to: https://hortonworks.com/tutorial/hadoop-tutorial-getting-started-with-hdp/
Thanks for the reply, Actually I want to develop some end to end application so can you suggest some tasks along with a its tech stack in hadoop, My intension is to become a big data engineer